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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac120789e9ab711f91f9933e9783ed6628bd30f34f48d9371a8ecbe0a5b8c4e4' 
  AND token = 'kAkYvHZGggMVBSBxyv7KGvrzWkxHynNGnc1t6+PLuY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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