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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89c47d04c24d583dece2127e57a3945cd428c3866873812a594e1669c2c55c7' 
  AND token = 'etEZVXsa4yY2QgCHhLNi1P1h1zqijgB67EunqPip7o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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