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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb9960b6e8347550be219b38d763799a0b3c30f37580d63cc368ae6e6814b4c' 
  AND token = 'TsnNELZmm1YyD0rwZDAJXQ5xCte5JUkgLyo0fPSfB5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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