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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5bee4bfc64fcb95c6ab4248f322498d5ec873a09c53a64a44d399eff513c30' 
  AND token = 'Dzh0EXspHhBFINPBFtbu9O5QQX8l/pa4fpuIktgmh+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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