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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4a0f65cb9e20c6bed7a500d88e482afb6d236494adc8a94a522201ddabe4e0' 
  AND token = 'Mp8Bajvw5b+RI7IhrmmgLp98nMYhBViYSbEg3/WRjc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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