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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8548d514ff0ffabc796d877f39a1a0291768b79c28dd04a6389adf261aba5bc8' 
  AND token = 'DK4eyTlJc2T6YG0rbYr2rXKtF8/i5f9rvQ6Sv4PsTLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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