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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849fa2fa7dc4a255566592b5c2e4194ec60230fc163b5aea9d493cde09624018' 
  AND token = '0jpnPt2eebI1Ss0a/R3AylOVnA/OaxiVcHJserYBjIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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