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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ccd55532d65ea160b8a7be6f571678e161c2bdeeed1f3e907a53ff48bf6b5b' 
  AND token = '8qYOPXf+j4kY45f73cEidvHA01pgavGcsThjjNWq+W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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