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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8e8f3d3a403942dd0ea68abd38310013afc94861c16e2b68269a2f6b8802cf' 
  AND token = 'FHpbUEKoapbmmvGV0Qn1pZF54SJVyozWF2ja1QbnE4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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