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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc114794399b81ec8e07a31b443db24585dd8a35eafa14817d5b9275066ef0c' 
  AND token = 'dwoSU+Ksi5lTWpOMTiCtAly/n1z+32HMGPEbUCg2sRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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