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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6923d915f42c43865c1ff310a38a412da0e8132f94b5fee4f1c9b1d2e1b36e8' 
  AND token = 'hpMd4SoUzyURBPuahZR7xUXBouf0ehZrxtSvOEFuagY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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