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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75dba0493b082ff9295de6e8a4f06b49dee2bb443f69969a692dde719716ab7' 
  AND token = 'V6TY8DNzttisV+z/fS9D588iLuCB+D+/6wfNcK+5/7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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