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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159ae54c330348578932f97d9001e8728ba95ff4bbaecda67799584e1e3d5028' 
  AND token = 'eI33gWTyB9mwkPBxSjgQqfCJV2/UN0ILUpTZ8ckB5BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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