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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cda92b42c49fe7aa4c2b5fa595a04d9cdf6d7806f5994ae1ef3842e5721e5c3' 
  AND token = 'ZMY5/NThczH60TBFPu0tb0umxqimuz3NmMRgKRJBJqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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