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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c4622f9f58d45d566a9564d0f4a218b16a623d06d7242a4d3ad98c7215f854' 
  AND token = 'sch+KkmNH9J2ulPRMfF+rfH7II9YyfUdPhXSiRrF7a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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