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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788a87401b33fff2332221b3852a0c72abac7a61b7e186a8e1b8deb5df4604c8' 
  AND token = '4OUoQpNLZnGorMyYKemLTpu///zjgKT4k7o429FGeSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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