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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5889b166d4a14a57197360f41da7e6447be85e0ed356da93406e6130826ebd7' 
  AND token = 'RLjpnDg0sOwMl5sxDW3kAVdtAPz/PT2zk3AKES3cSho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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