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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ef0c2917e7daaeced6a2991218a7304822afcbee2b55eef47a40cc830ec9d8' 
  AND token = '8t0OBMX61MxlSfO9CWGWVODgd0w9nH+msGU2mFF5FTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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