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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9344d4f47ac0ab361f1deb577b634905837f1bef9ec491b6b4498a86e25e151' 
  AND token = '2PzXW9wVUAArVQ0bXvMuNFvBknIbCsb2RejgOhCmVF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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