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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32ce9d613e709ed6f4ff1ee5557f7b54629d358b5604823971581fd0dfe7843' 
  AND token = '1b7p9woLxo/qKvnRCYecLdN69FV0hAmrucPkuonGP44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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