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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb055bf2891a124134fe8e2f3fc3f80a09a45a1f9a09e902289ef1d11138fd0' 
  AND token = '99UliDgQ1RuFKO0n0xo4MuY36C8LP84roQ5Kxo7wy34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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