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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a235ae9643c90b5711755a2a382f405858a6219fd92357a6edc399904f05bc' 
  AND token = 'q8RJplM12NvCAJNLcVVUXKT9ona+5kJO7q1wR4L70W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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