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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f7b09ba90e9d3f79e4be70dca353518e877dc4fa4a0acc80a6d9ea2a70eb18' 
  AND token = 'CDUs0tQBNyc2CobbfLdlmjfSShPfNRv3DF6wN2L18Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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