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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7b7fa3dab0e562dcd6d9a591bc2681982e5432c2b637bf2741ae64a43ecbe4' 
  AND token = 'rkA+2Slp7626MtfYPmr0Oqmrja0LUfSjL7+i3mDx1Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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