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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c7d22d80b5ad14b2b8ff88f68470c3b079c3061a187acf9795cac6ce32e8c8' 
  AND token = 'sAN/SK8t7Q8EkeL39JkHr49s0QE2wUaMIfEfdU9/RW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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