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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3a092cca90b11d7cb4c0a433d38362a7652f49dd72edf10b36f38e9bf176b9' 
  AND token = 'eefYhozdCqXmQt33sTookjXYNGKeFULVmQKV8W0EUXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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