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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6094ac8207cf44b8775bf65537680dfce8280ff605990c7459024cfcaf21007' 
  AND token = 'plqQTXjZw79rsDHY0CDjUStKYyz0c4jlC+1786FkVXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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