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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a3c06ee0f65de98ae570190749af4cdfbac662dc053e5f30660efafe088f9b' 
  AND token = 'Z7NWPp4ssG8iQIjaq0TW8T7pnW8ii7fy4ueki6zTmzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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