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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8036b48433270355404a2956eefba68b595765ae8b363e7fd8c6778d4fa08c3b' 
  AND token = '4hPSTkPC9iBpR2OHQpI03/2yC/XpoIR8fLkdFRdizZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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