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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0da6a973f3e162fca90d588761b56c869a5b94c8b54bf0c234c3a82fd707a1' 
  AND token = 'xlVh8ORbOwuF4BIgq5a0gaYv17ld2AyQpPBR7UPlzx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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