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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8462fbbbaf4f1bd05f15f9fccbb422dc0cd05f3e10c1970c3a92eeefb1319797' 
  AND token = '89mldgby+pXSUBpy5rCwzzaUEvgeUxh1RtphEcr/U9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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