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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fa9e4930ff94667e60e48930e15268a0fb9aeca5973a19a86da03fcd000cdb' 
  AND token = 'C4G5abRwhXLcnUmXPCG64N2vTIEnvp25MVIM8WHliDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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