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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2ad1aa337b7877f48f4a08d8cf8f718e50e1e16d1e73dc2f9257bf5a64776a' 
  AND token = 'eVZbh2pZFScdShmK6JVW6o0rm1CpkojxTDszM7Igxrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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