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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c066452f0f89f0aa274246aaf50d5e22e6a9a75a3b86d8133ceb110e7f7115d' 
  AND token = 'D5yZoxCbWnuF02r5gnoLVkF1+mVcEHbiRqhfDXBppdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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