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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59280fe77e73174b0fe58da1ff2977d6bf094ef61c124393260d951c39683d3' 
  AND token = 'ezexEHCjqaihKSkL1qARJhlsEEnxqZgSutiF5BRbP9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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