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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5c95fad95bb80a448616a0550bd3d7fa1f045aceec506ff72ff8963bbd7b09' 
  AND token = '7payVbaxKKtfo7Mwxku4F0QSEuFJphLV5r5QULdFBQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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