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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58b36364153d82a6a0f0b84d05492b1a9afeaad9ad7bd2a3ded4e5f717c5df7' 
  AND token = 'dvwcqjhUYPjLnNd6TWII7TqC+BwbLYeyziPlQPG7t5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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