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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba21c7dfc669ec25d02133d151796d272e3171deeffdbd3d456fb43100b492a' 
  AND token = 'nlXJcmpmB+UOLRZWMn+5hi+E+8gVO5GDFdrAsX/eEO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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