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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428168068eae4ef5242e04a1095a01c8864602f4d61028a381f73b137f328c1e' 
  AND token = 'zO6+61j42rUqPPrtLH0gl4KPh/RlOI7beKekjcb3nG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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