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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b2bc40a07a8e62235ae75b0150232d6b901acd4bd5ee657fe1ff264d0b7538' 
  AND token = 'O93o5AejZju0U/OVvtyEfhpXVSbZgpEYeMej4DQ2Q7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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