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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797157ee799df85e84f007267ad7aeb075dc868c196bcd611d1cad6e1d47ecfc' 
  AND token = 'kS7RbsjWdBEymQ/r0zo2N8GI3Ryaw+3rjYMkP7Lasl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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