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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a0e8a1e95779c8c219112784539aa1a15e091d9f5a4356cb7cf6a9728525f2' 
  AND token = '44zHnjNeTlSp2VPbefuJ0i2C2IjO1Md9/xHepCc12sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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