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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb642da7158add522c7007313629443c36da97d335fac92ae3ff2a199deaf700' 
  AND token = '9lKAdXaVUe1WRG3Qmu03xuGAAQ3NYWCXB84KCp854NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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