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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9ae45f52b6112072520f3cf931d52bf854d3ad47b63be8df535c88e9dd9f4a' 
  AND token = 'xvukrZ/BPjMbo3mkd2OPXNGPohnBNYWS3CdclSF4gOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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