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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e407a4af403843601b93e9019df0ac02c127e0a248b087f51db95d772bd70b' 
  AND token = 'JLVJtsw0jgwM+4YmuNexY2YOUNTUpOLfhsAoKumtMig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}