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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0207940a5fb7a0deee1c50f30702f4b2ced4b3080a0f66f9c7241f0c3322af3e' 
  AND token = 'H2XEXfc5EO4wIcATT2tK/lAd2XIHzW8UqEpZHzjxdHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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