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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bf5bab245ef2ea116fc2a2c0fb34adaa9c75f870d18c6808b051a1fe524b8a' 
  AND token = 'GceAtF1zvJ6hZW7t32+nCMDZ0USUeZt8keSWWT0OAzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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