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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2183c72d867707160c0c080bd589b38818f8767c2b8403fa4be2f39dbd40866d' 
  AND token = 'EgW0bi+BPaOi6fAXOJqhG3rxRjLGkI0QzB/D1n91cxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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