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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c9f887886b72a8f2b68ec45c7edeb93871eda000e344b07c3190a5e3d7ebdf' 
  AND token = 'FySThOZQdDDDZ9E7BRjNyGU0sCUhIvytlbvmUDoOp4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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