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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba46e2a2796ce2e2f321e29b50fc09a995da99200612cca9789a717984381a1' 
  AND token = '0JdCj9Ngn4pway0h5y+D40j8Qs05Kyyh3igAsmFOu7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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