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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45eb1fc635c1f7791962dc08cb6992d93ba15cccbf6dd05eb947c3323a54b82' 
  AND token = '42XoCwRpo8D96rLYQcpbDbYWkJGBiw27Fl8KJZKX3+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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