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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf83ada6150ff2c2b9732ee6f66d383205660f5f5020a84e41a82f4b0d0fe20' 
  AND token = '0Wzmrfw6aFPj4IF2yMPRmxBb7zGM03jKyEENjk8oEck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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