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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b33b35e0712972ed4280df4139504eba13689c0abb2a5c5ba32df17c69916bc' 
  AND token = 'SHDhe8SV7g9rTLW3VcuW1ULNxN2qS93QEZ+5q1V7ueg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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