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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541fb13dd30ef781912bd0b51d78776f7e220c6e08ecdaae512fe2d3bdf85064' 
  AND token = 'KvYhk7wK7gqskJPRrOXRb/a6PYsz3BaA71d3mAG0L2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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