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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a90a5b206364b0b6c20feab7a1091e967e447fa478c8b718033ef8752d8e72' 
  AND token = 'F0FaMdrvegWI36b4EWDsO6UAaNDbTRhqtOPyeekqcq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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