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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0949eee28e7bb9937ef8504390fa9e12634254112944537b29c14efdf419dd' 
  AND token = '2ug4EEpIemzqhsD/Qzv1bmec8xX6Xpv/stJUX7+FUTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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