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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe19e392e0b80d9f00c2ea2808d3fef116ba51d7d4bfd69220651a38f2cd5bc' 
  AND token = 'JqRokeCjdloALe0y9LLC2JKWPF2hXRo6StwyO9QXSH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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