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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f14a6644cce2c8e9bfd562c81cef516a88b3da081ded3d8d819c45d8a5170a' 
  AND token = 'OmyBAw/3UZ6o7OTNCx08rRiIGaJzzQIxNXkF4nOziOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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