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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0d8b8c57f302925ce74000023399e9951ed5ccbb152f9a1f4efa0dfbea438e' 
  AND token = 'eG6IGyX2o96ydDm5H6yrH2AA+p2Rv/g4kIinAcdNwDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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