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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5594c484bc587bdb99b319444d7dfe5e1220ecd0d0f0cca963a2f2445f5931b0' 
  AND token = 'owjT4RRnKlwwpIpr4bZFIxI1VozKcx+4doSED2SQxd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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