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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc7eb6a1ba0fb4cc2a0a28a1a704abc1ac0d3be5fd7dd921e9497891b9964a0' 
  AND token = 'T1z/NvkPFFjuREyvHNm8w9k0C7qxL0HE5gpaJHNLngo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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